Hydraulic servo proportional control device

Abstract

The utility model discloses a hydraulic servo proportional control device, and relates to the technical field of hydraulic servo proportional control. The hydraulic servo proportional control device comprises a hydraulic cylinder, a high-low speed conversion device, a servo proportional valve control unit, a large pump pressure protection unit, a small pump pressure protection unit, a double-pump control unit, an oil tank assembly and an electric control cabinet, the low-speed conversion device, the servo proportional valve control unit, the large pump pressure protection unit, the small pump pressure protection unit and the double-pump control unit are all connected with the electric control cabinet, the double-pump control unit is communicated with the oil tank assembly, and the double-pump control unit is connected with the large pump pressure protection unit and the small pump pressure protection unit through pipelines. The small pump pressure protection unit is connected with the large pump pressure protection unit, the servo proportional valve control unit and the high-low speed conversion device through pipelines, and the large pump pressure protection unit is communicated with the servo proportional valve control unit and the output end of the hydraulic cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic servo proportional control technical field, concretely is a kind of hydraulic servo proportional control device. BACKGROUND

[0002] With the continuous progress of industrial automation production, the continuous development of hydraulic proportional technology, the continuous improvement of electrical automation components and overall equipment technology, and the combination of hydraulic control technology and electrical control automation control, control machinery, structure transmission has been greatly improved.

[0003] How to realize the hydraulic cylinder on equipment to complete high, low speed control, high, low pressure control simultaneously, control precision is 0.02%, positioning cycle is 3 times above / min, control hydraulic system fast process in the large flow, and high-precision positioning process in the high pressure small flow. How to use electric control measurement, feedback, control signal collection, input, calculation and output carry out closed-loop control to achieve the result that we need, realize high-precision control. UTILITY MODEL CONTENT

[0004] (One technical problem solved

[0005] In view of the deficiency of prior art, the utility model provides a kind of hydraulic servo proportional control device, solves the problem that the existing hydraulic control system is difficult to realize the hydraulic cylinder to complete high, low speed control, high, low pressure control simultaneously.

[0006] (Two technical solutions

[0007] To realize the above object, the utility model is realized by the following technical scheme:

[0008] The utility model provides a kind of hydraulic servo proportional control device, comprising: hydraulic cylinder, fast slow conversion device, servo proportional valve control unit, big pump pressure protection unit, small pump pressure protection unit, double pump control unit, oil tank assembly and electric control cabinet, the slow conversion device, servo proportional valve control unit, big pump pressure protection unit, small pump pressure protection unit, double pump control unit are electrically connected between electric control cabinet, the double pump control unit is communicated with oil tank assembly, the double pump control unit is connected with big pump pressure protection unit, small pump pressure protection unit by shielded flexible cord, small pump pressure protection unit is connected with big pump pressure protection unit, servo proportional valve control unit, fast slow conversion device by pipeline, big pump pressure protection unit is communicated with servo proportional valve control unit, hydraulic cylinder output end, servo proportional valve control unit is connected with hydraulic cylinder, fast slow conversion device by pipeline, the fast slow conversion device is communicated with hydraulic cylinder, small pump pressure protection unit, big pump pressure protection unit are communicated with oil tank assembly, the fast slow conversion device is equipped with a plurality of check valve and control valve in inside, the double pump control unit is equipped with two pumps with different pressure, different flow in inside.

[0009] Preferably, the big pump pressure protection unit is connected with an accumulator on one side.

[0010] Preferably, a cooler is connected in the pipeline connecting the small pump pressure protection unit and the oil tank assembly.

[0011] Preferably, filters are installed in the connecting pipelines of the big pump pressure protection unit and the small pump pressure protection unit and the oil tank assembly.

[0012] Preferably, hydraulic control check valves are installed in the pipelines of the hydraulic cylinder output end, the big pump pressure protection unit and the servo proportional valve control unit.

[0013] Preferably, liquid level controllers and temperature detection controllers are installed in the oil tank assembly.

[0014] Preferably, the pump responsible for medium-low pressure and large flow in the double pump control unit is a constant-pressure variable plunger pump, and the double pump control unit shares one motor for transmission.

[0015] (Three beneficial effects

[0016] Compared with the prior art, the hydraulic servo proportional control device provided by the utility model has at least the following beneficial effects:

[0017] The hydraulic servo proportional control device, the servo proportional control unit is controlled under the high-precision electric controller, can realize the quick, slow, fine control of the speed of the hydraulic cylinder, the accurate positioning oil cylinder, the quick and slow conversion function unit of the hydraulic cylinder is the oil return flow of the hydraulic cylinder when realizing the quick work is returned to the pressure cavity of the servo proportional control unit, improves the working flow, thereby improves the running speed of the hydraulic cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 The schematic diagram of the utility model;

[0019] Fig. 2 The flow chart of the utility model.

[0020] In the drawing: 1, hydraulic cylinder; 2, quick and slow conversion device; 3, servo proportional valve control unit; 4, big pump pressure protection unit; 5, small pump pressure protection unit; 6, double pump control unit; 7, oil tank assembly; 8, electric control cabinet; 21, energy accumulator; 22, cooler; 23, filter; 24, hydraulic control check valve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] Please refer to Figs. 1-2The utility model provides a technical scheme: a kind of hydraulic servo proportional control device, comprising: hydraulic cylinder 1, fast slow conversion device 2, servo proportional valve control unit 3, big pump pressure protection unit 4, small pump pressure protection unit 5, double pump control unit 6, oil tank assembly 7 and electric control cabinet 8, the slow conversion device 2, servo proportional valve control unit 3, big pump pressure protection unit 4, small pump pressure protection unit 5, double pump control unit 6 are electrically connected between electric control cabinet 8, the double pump control unit 6 with oil tank assembly 7 intercommunication, the double pump control unit 6 is connected with big pump pressure protection unit 4, small pump pressure protection unit 5 by shielded flexible cord, small pump pressure protection unit 5 is connected with big pump pressure protection unit 4, servo proportional valve control unit 3, fast slow conversion device 2 by pipeline, big pump pressure protection unit 4 is communicated with servo proportional valve control unit 3, hydraulic cylinder 1 output end, the servo proportional valve control unit 3 is connected with hydraulic cylinder 1, fast slow conversion device 2 by pipeline, the fast slow conversion device 2 is communicated with hydraulic cylinder 1, small pump pressure protection unit 5, big pump pressure protection unit 4 are communicated with oil tank assembly 7, the fast slow conversion device 2 is equipped with multiple check valves and control valve in inside, the double pump control unit 6 is equipped with two pumps with different pressure, different flow in inside.

[0023] When using, after starting system by electric control cabinet 8, if needing high speed to drop, the two pumps of double pump control unit 6 will be started, and enable valve inside big pump pressure protection unit 4 and small pump pressure protection unit 5 is opened simultaneously, and the pump inside double pump control unit 6 will pump the oil inside oil tank assembly 7 into big pump pressure protection unit 4 and small pump pressure protection unit 5, and then the oil inside big pump pressure protection unit 4 will flow into the inside of hydraulic cylinder 1 after passing through servo proportional valve control unit 3, and the oil inside small pump pressure protection unit 5 will flow into the inside of hydraulic cylinder 1 after passing through fast slow conversion device 2 and servo proportional valve control unit 3, at this time, the flow of servo proportional valve control unit 3 is increased, the extension end of hydraulic cylinder 1 drops rapidly, and electric control cabinet 8 will close enable valve after reaching the set position, and hydraulic cylinder 1 stops. When needing low speed high pressure to rise, high pressure holding valve inside big pump pressure protection unit 4 and small pump pressure protection unit 5 is opened, the output end opening of right side of servo proportional valve control unit 3 is reduced, fast slow conversion device 2 is adjusted to low speed, and the flow of hydraulic cylinder 1 output end is reduced, at this time, hydraulic cylinder 1 is low speed high pressure to rise, and the extension end position of hydraulic cylinder 1 is kept fixed after closing high pressure holding valve and reaching the set position. When needing low pressure high speed to rise, enable valve is opened, and hydraulic cylinder 1 is low pressure high speed to rise, and will be resident, and reaches the set position after reaching the set position, and closes enable valve, and hydraulic cylinder 1 stops.

[0024] As Figs. 1-2 shown, the utility model embodiment provides a kind of implementation, based on above implementation, big pump pressure protection unit 4 side is connected with energy accumulator 21.

[0025] As can be seen from the above structure, the excess oil flowing into the inside of the large pump pressure protection unit 4 will be stored in the accumulator 21, and when needed, the oil will be released to supplement the system.

[0026] As shown in Figs. 1-2 embodiments of the utility model provide an implementation mode, based on above implementation mode, the pipeline that small pump pressure protection unit 5 is connected with oil tank assembly 7 is connected with cooler 22.

[0027] As can be seen from the above structure, after the oil in the inside of the small pump pressure protection unit 5 flows out, the oil will be cooled by the cooler 22 and then flow into the inside of the oil tank assembly 7 to prevent the oil temperature from being too high.

[0028] As shown in Figs. 1-2 embodiments of the utility model provide an implementation mode, based on above implementation mode, the connecting pipeline of large pump pressure protection unit 4 and small pump pressure protection unit 5 and oil tank assembly 7 is installed with filter 23.

[0029] As can be seen from the above structure, the oil flowing out of the large pump pressure protection unit 4 and the small pump pressure protection unit 5 will finally gather in the inside of a pipeline, and the oil will be filtered by the filter 23 when entering the oil tank assembly 7 to reduce impurities in the oil.

[0030] As shown in Figs. 1-2 embodiments of the utility model provide an implementation mode, based on above implementation mode, the pipeline of hydraulic cylinder 1 output end, large pump pressure protection unit 4 and one side output end of servo proportional valve control unit 3 is installed with hydraulic control check valve 24.

[0031] As can be seen from the above structure, the hydraulic control check valve 24 installed in the pipeline of the hydraulic cylinder 1 output end, the large pump pressure protection unit 4 and one side output end of the servo proportional valve control unit 3 can prevent the oil from flowing back and causing equipment failure.

[0032] As shown in Figs. 1-2 embodiments of the utility model provide an implementation mode, based on above implementation mode, the inside of oil tank assembly 7 is installed with liquid level controller and temperature detection controller.

[0033] As can be seen from the above structure, the liquid level controller and the temperature detection controller can control the height of the oil in the inside of the oil tank assembly 7 and the temperature of the oil to reduce the probability of failure.

[0034] As shown in Figs. 1-2The utility model discloses an embodiment provides a kind of implementation mode, based on above-mentioned implementation mode, the pump responsible for medium-low pressure large flow in the double pump control unit 6 is constant pressure variable plunger pump, the double pump control unit 6 share a motor transmission.

[0035] From the analysis of the above structure, the pump with medium-low pressure large flow is constant pressure variable plunger pump, which has the advantages of high parameters, high efficiency, long service life, variable convenience, and light weight per unit power. The double pump control unit 6 shares a motor transmission, saving space and power waste.

[0036] It should be noted that in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A hydraulic servo proportional control device, characterized in that, Include: Hydraulic cylinder (1), fast and slow conversion device (2), servo proportional valve control unit (3), large pump pressure protection unit (4), small pump pressure protection unit (5), double pump control unit (6), oil tank assembly (7) and electric control cabinet (8), the slow conversion device (2), servo proportional valve control unit (3), large pump pressure protection unit (4), small pump pressure protection unit (5), double pump control unit (6) are electrically connected between electric control cabinet (8), the double pump control unit (6) is communicated with oil tank assembly (7), the double pump control unit (6) is connected with large pump pressure protection unit (4), small pump pressure protection unit (5) through shielded wire, the small pump pressure protection unit (5) is connected with large pump pressure protection unit (4), servo proportional valve control unit (3), fast and slow conversion device (2) through pipeline, the large pump pressure protection unit (4) is communicated with servo proportional valve control unit (3), hydraulic cylinder (1) output end, the servo proportional valve control unit (3) is connected with hydraulic cylinder (1), fast and slow conversion device (2) through pipeline, the fast and slow conversion device (2) is communicated with hydraulic cylinder (1), the small pump pressure protection unit (5), large pump pressure protection unit (4) are communicated with oil tank assembly (7), the fast and slow conversion device (2) is internally provided with a plurality of check valves and control valves, the double pump control unit (6) is internally provided with two pumps with different pressure and different flow.

2. A hydraulic servo proportional control device according to claim 1, characterized in that: The large pump pressure protection unit (4) is connected with an accumulator (21) on one side.

3. A hydraulic servo proportional control device according to claim 1, wherein: The pipeline connected between the small pump pressure protection unit (5) and the oil tank assembly (7) is connected with a cooler (22).

4. A hydraulic servo proportional control device according to claim 1, wherein: The connecting pipeline between the large pump pressure protection unit (4) and the small pump pressure protection unit (5) and the oil tank assembly (7) is provided with a filter (23).

5. A hydraulic servo proportional control device according to claim 1, wherein: The pipeline between the hydraulic cylinder (1) output end, the large pump pressure protection unit (4) and the servo proportional valve control unit (3) one side output end is provided with a hydraulic control check valve (24).

6. A hydraulic servo proportional control device according to claim 1, wherein: The oil tank assembly (7) is internally provided with a liquid level controller and a temperature detection controller.

7. A hydraulic servo proportional control device according to claim 1, wherein: The double pump control unit (6) is internally provided with a constant pressure variable plunger pump responsible for medium and low pressure and large flow, and the double pump control unit (6) shares a motor for transmission.

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